Integrate payments with SePay (VietQR), Polar, Stripe, Paddle (MoR subscriptions), Creem.io (licensing). Checkout, webhooks, subscriptions, QR codes,…
Payment Integration Production-proven payment processing with SePay (Vietnamese banks), Polar (global SaaS), Stripe (global infrastructure), Paddle (MoR subscriptions), and Creem.io (MoR + licensing). When to Use Payment gateway integration (checkout, processing) Subscription management (trials, upgrades, billing) Webhook handling (notifications, idempotency) QR code payments (VietQR, NAPAS) Software licensing (device activation) Multi-provider order management Revenue splits and commissions Platform Selection Platform Best For SePay Vietnamese market, VND, bank transfers, VietQR Polar Global SaaS, subscriptions, automated benefits (GitHub/Discord) Stripe Enterprise payments, Connect platforms, custom checkout Paddle MoR subscriptions, global tax compliance, churn prevention Creem.io MoR + licensing, revenue splits, no-code checkout Quick Reference SePay references/sepay/overview.md - Auth, supported banks references/sepay/api.md - Endpoints, transactions references/sepay/webhooks.md - Setup, verification references/sepay/sdk.md - Node.js, PHP, Laravel references/sepay/qr-codes.md - VietQR generation references/sepay/best-practices.md - Production patterns Polar references/polar/overview.md - Auth, MoR concept references/polar/products.md - Pricing models references/polar/checkouts.md - Checkout flows references/polar/subscriptions.md - Lifecycle management references/polar/webhooks.md - Event handling references/polar/benefits.md - Automated delivery references/polar/sdk.md - Multi-language SDKs references/polar/best-practices.md - Production patterns Stripe references/stripe/stripe-best-practices.md - Integration design references/stripe/stripe-sdks.md - Server SDKs references/stripe/stripe-js.md - Payment Element references/stripe/stripe-cli.md - Local testing references/stripe/stripe-upgrade.md - Version upgrades External: https://docs.stripe.com/llms.txt Paddle references/paddle/overview.md - MoR, auth, entity IDs references/paddle/api.md - Products, prices, transactions references/paddle/paddle-js.md - Checkout overlay/inline references/paddle/subscriptions.md - Trials, upgrades, pause references/paddle/webhooks.md - SHA256 verification references/paddle/sdk.md - Node, Python, PHP, Go references/paddle/best-practices.md - Production patterns External: https://developer.paddle.com/llms.txt Creem.io references/creem/overview.md - MoR, auth, global support references/creem/api.md - Products, checkout sessions references/creem/checkouts.md - No-code links, storefronts references/creem/subscriptions.md - Trials, seat-based references/creem/licensing.md - Device activation references/creem/webhooks.md - Signature verification references/creem/sdk.md - Next.js, Better Auth External: https://docs.creem.io/llms.txt Multi-Provider references/multi-provider-order-management-patterns.md - Unified orders, currency conversion Scripts scripts/sepay-webhook-verify.js - SePay webhook verification scripts/polar-webhook-verify.js - Polar webhook verification scripts/checkout-helper.js - Checkout session generator Key Capabilities Platform Highlights SePay QR/bank/cards, 44+ VN banks, webhooks, 2 req/s Polar MoR, subscriptions, usage billing, benefits, 300 req/min Stripe CheckoutSessions, Billing, Connect, Payment Element Paddle MoR, overlay/inline checkout, Retain (churn prevention), tax Creem.io MoR, licensing, revenue splits, no-code checkout Implementation See references/implementation-workflows.md for step-by-step guides per platform. General flow: auth → products → checkout → webhooks → events
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